I have three sites.
Each sites has own exchange server, and each server has public url access.
Each Exchange server has different certificate.
Email for site A is *@A.com. Email for site B is
*@B.A.com. Email for site C is *@C.A.com.
External URL-s follow e-mail naming. Site A: mail.A.Com, Site B: mail.B.A.Com and Site C: webmail.C.A.com.
Can I create additional two EXPR provider-s and define Server and CertPrincipalName, and have successful connection.